datasets: add sorting
datasets.html: icons when sorting
Merge pull request #174 from uwescience/dhalperi-sort-datasets-page

Dhalperi sort datasets page
fix missing semicolon。
Merge pull request #175 from uwescience/shumo_small_fix_on_editor_js

fix missing semicolon
Merge branch 'master' into yorkw-ccatalog

Conflicts:
	appengine/js/editor.js
	appengine/templates/datasets.html